*
*/
-#ifndef _LINUX_ION_H
-#define _LINUX_ION_H
+#ifndef _ION_H
+#define _ION_H
+#include <linux/device.h>
+#include <linux/dma-direction.h>
+#include <linux/kref.h>
+#include <linux/mm_types.h>
+#include <linux/mutex.h>
+#include <linux/rbtree.h>
+#include <linux/sched.h>
+#include <linux/shrinker.h>
#include <linux/types.h>
+#include <linux/miscdevice.h>
#include "../uapi/ion.h"
-struct ion_handle;
-struct ion_device;
-struct ion_heap;
-struct ion_mapper;
-struct ion_client;
-struct ion_buffer;
-
/**
* struct ion_platform_heap - defines a heap in the given platform
* @type: type of the heap from ion_heap_type enum
- * @id: unique identifier for heap. When allocating higher numbers
+ * @id: unique identifier for heap. When allocating higher numb ers
* will be allocated from first. At allocation these are passed
* as a bit mask and therefore can not exceed ION_NUM_HEAP_IDS.
* @name: used for debug purposes
};
/**
- * struct ion_platform_data - array of platform heaps passed from board file
- * @nr: number of structures in the array
- * @heaps: array of platform_heap structions
+ * struct ion_buffer - metadata for a particular buffer
+ * @ref: reference count
+ * @node: node in the ion_device buffers tree
+ * @dev: back pointer to the ion_device
+ * @heap: back pointer to the heap the buffer came from
+ * @flags: buffer specific flags
+ * @private_flags: internal buffer specific flags
+ * @size: size of the buffer
+ * @priv_virt: private data to the buffer representable as
+ * a void *
+ * @lock: protects the buffers cnt fields
+ * @kmap_cnt: number of times the buffer is mapped to the kernel
+ * @vaddr: the kernel mapping if kmap_cnt is not zero
+ * @sg_table: the sg table for the buffer if dmap_cnt is not zero
+ * @pages: flat array of pages in the buffer -- used by fault
+ * handler and only valid for buffers that are faulted in
+ * @vmas: list of vma's mapping this buffer
+ * @handle_count: count of handles referencing this buffer
+ * @task_comm: taskcomm of last client to reference this buffer in a
+ * handle, used for debugging
+ * @pid: pid of last client to reference this buffer in a
+ * handle, used for debugging
+ */
+struct ion_buffer {
+ struct kref ref;
+ union {
+ struct rb_node node;
+ struct list_head list;
+ };
+ struct ion_device *dev;
+ struct ion_heap *heap;
+ unsigned long flags;
+ unsigned long private_flags;
+ size_t size;
+ void *priv_virt;
+ struct mutex lock;
+ int kmap_cnt;
+ void *vaddr;
+ struct sg_table *sg_table;
+ struct page **pages;
+ struct list_head vmas;
+ struct list_head attachments;
+ /* used to track orphaned buffers */
+ int handle_count;
+ char task_comm[TASK_COMM_LEN];
+ pid_t pid;
+};
+void ion_buffer_destroy(struct ion_buffer *buffer);
+
+/**
+ * struct ion_device - the metadata of the ion device node
+ * @dev: the actual misc device
+ * @buffers: an rb tree of all the existing buffers
+ * @buffer_lock: lock protecting the tree of buffers
+ * @lock: rwsem protecting the tree of heaps and clients
+ * @heaps: list of all the heaps in the system
+ * @user_clients: list of all the clients created from userspace
+ */
+struct ion_device {
+ struct miscdevice dev;
+ struct rb_root buffers;
+ struct mutex buffer_lock;
+ struct rw_semaphore lock;
+ struct plist_head heaps;
+ struct rb_root clients;
+ struct dentry *debug_root;
+ struct dentry *heaps_debug_root;
+ struct dentry *clients_debug_root;
+ int heap_cnt;
+};
+
+/**
+ * struct ion_client - a process/hw block local address space
+ * @node: node in the tree of all clients
+ * @dev: backpointer to ion device
+ * @handles: an rb tree of all the handles in this client
+ * @idr: an idr space for allocating handle ids
+ * @lock: lock protecting the tree of handles
+ * @name: used for debugging
+ * @display_name: used for debugging (unique version of @name)
+ * @display_serial: used for debugging (to make display_name unique)
+ * @task: used for debugging
+ *
+ * A client represents a list of buffers this client may access.
+ * The mutex stored here is used to protect both handles tree
+ * as well as the handles themselves, and should be held while modifying either.
+ */
+struct ion_client {
+ struct rb_node node;
+ struct ion_device *dev;
+ struct rb_root handles;
+ struct idr idr;
+ struct mutex lock;
+ const char *name;
+ char *display_name;
+ int display_serial;
+ struct task_struct *task;
+ pid_t pid;
+ struct dentry *debug_root;
+};
+
+/**
+ * ion_handle - a client local reference to a buffer
+ * @ref: reference count
+ * @client: back pointer to the client the buffer resides in
+ * @buffer: pointer to the buffer
+ * @node: node in the client's handle rbtree
+ * @kmap_cnt: count of times this client has mapped to kernel
+ * @id: client-unique id allocated by client->idr
+ *
+ * Modifications to node, map_cnt or mapping should be protected by the
+ * lock in the client. Other fields are never changed after initialization.
+ */
+struct ion_handle {
+ struct kref ref;
+ struct ion_client *client;
+ struct ion_buffer *buffer;
+ struct rb_node node;
+ unsigned int kmap_cnt;
+ int id;
+};
+
+/**
+ * struct ion_heap_ops - ops to operate on a given heap
+ * @allocate: allocate memory
+ * @free: free memory
+ * @map_kernel map memory to the kernel
+ * @unmap_kernel unmap memory to the kernel
+ * @map_user map memory to userspace
*
- * Provided by the board file in the form of platform data to a platform device.
+ * allocate, phys, and map_user return 0 on success, -errno on error.
+ * map_dma and map_kernel return pointer on success, ERR_PTR on
+ * error. @free will be called with ION_PRIV_FLAG_SHRINKER_FREE set in
+ * the buffer's private_flags when called from a shrinker. In that
+ * case, the pages being free'd must be truly free'd back to the
+ * system, not put in a page pool or otherwise cached.
*/
-struct ion_platform_data {
- int nr;
- struct ion_platform_heap *heaps;
+struct ion_heap_ops {
+ int (*allocate)(struct ion_heap *heap,
+ struct ion_buffer *buffer, unsigned long len,
+ unsigned long flags);
+ void (*free)(struct ion_buffer *buffer);
+ void * (*map_kernel)(struct ion_heap *heap, struct ion_buffer *buffer);
+ void (*unmap_kernel)(struct ion_heap *heap, struct ion_buffer *buffer);
+ int (*map_user)(struct ion_heap *mapper, struct ion_buffer *buffer,
+ struct vm_area_struct *vma);
+ int (*shrink)(struct ion_heap *heap, gfp_t gfp_mask, int nr_to_scan);
};
/**
- * ion_client_create() - allocate a client and returns it
- * @dev: the global ion device
+ * heap flags - flags between the heaps and core ion code
+ */
+#define ION_HEAP_FLAG_DEFER_FREE (1 << 0)
+
+/**
+ * private flags - flags internal to ion
+ */
+/*
+ * Buffer is being freed from a shrinker function. Skip any possible
+ * heap-specific caching mechanism (e.g. page pools). Guarantees that
+ * any buffer storage that came from the system allocator will be
+ * returned to the system allocator.
+ */
+#define ION_PRIV_FLAG_SHRINKER_FREE (1 << 0)
+
+/**
+ * struct ion_heap - represents a heap in the system
+ * @node: rb node to put the heap on the device's tree of heaps
+ * @dev: back pointer to the ion_device
+ * @type: type of heap
+ * @ops: ops struct as above
+ * @flags: flags
+ * @id: id of heap, also indicates priority of this heap when
+ * allocating. These are specified by platform data and
+ * MUST be unique
* @name: used for debugging
+ * @shrinker: a shrinker for the heap
+ * @free_list: free list head if deferred free is used
+ * @free_list_size size of the deferred free list in bytes
+ * @lock: protects the free list
+ * @waitqueue: queue to wait on from deferred free thread
+ * @task: task struct of deferred free thread
+ * @debug_show: called when heap debug file is read to add any
+ * heap specific debug info to output
+ *
+ * Represents a pool of memory from which buffers can be made. In some
+ * systems the only heap is regular system memory allocated via vmalloc.
+ * On others, some blocks might require large physically contiguous buffers
+ * that are allocated from a specially reserved heap.
*/
-struct ion_client *ion_client_create(struct ion_device *dev,
- const char *name);
+struct ion_heap {
+ struct plist_node node;
+ struct ion_device *dev;
+ enum ion_heap_type type;
+ struct ion_heap_ops *ops;
+ unsigned long flags;
+ unsigned int id;
+ const char *name;
+ struct shrinker shrinker;
+ struct list_head free_list;
+ size_t free_list_size;
+ spinlock_t free_lock;
+ wait_queue_head_t waitqueue;
+ struct task_struct *task;
+
+ int (*debug_show)(struct ion_heap *heap, struct seq_file *, void *);
+};
/**
- * ion_client_destroy() - free's a client and all it's handles
- * @client: the client
+ * ion_buffer_cached - this ion buffer is cached
+ * @buffer: buffer
*
- * Free the provided client and all it's resources including
- * any handles it is holding.
+ * indicates whether this ion buffer is cached
*/
-void ion_client_destroy(struct ion_client *client);
+bool ion_buffer_cached(struct ion_buffer *buffer);
/**
- * ion_alloc - allocate ion memory
- * @client: the client
- * @len: size of the allocation
- * @heap_id_mask: mask of heaps to allocate from, if multiple bits are set
- * heaps will be tried in order from highest to lowest
- * id
- * @flags: heap flags, the low 16 bits are consumed by ion, the
- * high 16 bits are passed on to the respective heap and
- * can be heap custom
+ * ion_buffer_fault_user_mappings - fault in user mappings of this buffer
+ * @buffer: buffer
*
- * Allocate memory in one of the heaps provided in heap mask and return
- * an opaque handle to it.
+ * indicates whether userspace mappings of this buffer will be faulted
+ * in, this can affect how buffers are allocated from the heap.
*/
-struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
- unsigned int heap_id_mask,
- unsigned int flags);
+bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer);
/**
- * ion_free - free a handle
- * @client: the client
- * @handle: the handle to free
+ * ion_device_create - allocates and returns an ion device
*
- * Free the provided handle.
+ * returns a valid device or -PTR_ERR
+ */
+struct ion_device *ion_device_create(void);
+
+/**
+ * ion_device_destroy - free and device and it's resource
+ * @dev: the device
+ */
+void ion_device_destroy(struct ion_device *dev);
+
+/**
+ * ion_device_add_heap - adds a heap to the ion device
+ * @dev: the device
+ * @heap: the heap to add
*/
+void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap);
+
+/**
+ * some helpers for common operations on buffers using the sg_table
+ * and vaddr fields
+ */
+void *ion_heap_map_kernel(struct ion_heap *heap, struct ion_buffer *buffer);
+void ion_heap_unmap_kernel(struct ion_heap *heap, struct ion_buffer *buffer);
+int ion_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
+ struct vm_area_struct *vma);
+int ion_heap_buffer_zero(struct ion_buffer *buffer);
+int ion_heap_pages_zero(struct page *page, size_t size, pgprot_t pgprot);
+
+struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
+ unsigned int heap_id_mask,
+ unsigned int flags);
+
void ion_free(struct ion_client *client, struct ion_handle *handle);
+int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle);
+
/**
- * ion_map_kernel - create mapping for the given handle
- * @client: the client
- * @handle: handle to map
+ * ion_heap_init_shrinker
+ * @heap: the heap
*
- * Map the given handle into the kernel and return a kernel address that
- * can be used to access this address.
+ * If a heap sets the ION_HEAP_FLAG_DEFER_FREE flag or defines the shrink op
+ * this function will be called to setup a shrinker to shrink the freelists
+ * and call the heap's shrink op.
*/
-void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle);
+void ion_heap_init_shrinker(struct ion_heap *heap);
/**
- * ion_unmap_kernel() - destroy a kernel mapping for a handle
- * @client: the client
- * @handle: handle to unmap
+ * ion_heap_init_deferred_free -- initialize deferred free functionality
+ * @heap: the heap
+ *
+ * If a heap sets the ION_HEAP_FLAG_DEFER_FREE flag this function will
+ * be called to setup deferred frees. Calls to free the buffer will
+ * return immediately and the actual free will occur some time later
*/
-void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle);
+int ion_heap_init_deferred_free(struct ion_heap *heap);
/**
- * ion_share_dma_buf() - share buffer as dma-buf
- * @client: the client
- * @handle: the handle
+ * ion_heap_freelist_add - add a buffer to the deferred free list
+ * @heap: the heap
+ * @buffer: the buffer
+ *
+ * Adds an item to the deferred freelist.
*/
-struct dma_buf *ion_share_dma_buf(struct ion_client *client,
- struct ion_handle *handle);
+void ion_heap_freelist_add(struct ion_heap *heap, struct ion_buffer *buffer);
/**
- * ion_share_dma_buf_fd() - given an ion client, create a dma-buf fd
- * @client: the client
- * @handle: the handle
+ * ion_heap_freelist_drain - drain the deferred free list
+ * @heap: the heap
+ * @size: amount of memory to drain in bytes
+ *
+ * Drains the indicated amount of memory from the deferred freelist immediately.
+ * Returns the total amount freed. The total freed may be higher depending
+ * on the size of the items in the list, or lower if there is insufficient
+ * total memory on the freelist.
*/
-int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle);
+size_t ion_heap_freelist_drain(struct ion_heap *heap, size_t size);
/**
- * ion_import_dma_buf() - get ion_handle from dma-buf
- * @client: the client
- * @dmabuf: the dma-buf
+ * ion_heap_freelist_shrink - drain the deferred free
+ * list, skipping any heap-specific
+ * pooling or caching mechanisms
+ *
+ * @heap: the heap
+ * @size: amount of memory to drain in bytes
+ *
+ * Drains the indicated amount of memory from the deferred freelist immediately.
+ * Returns the total amount freed. The total freed may be higher depending
+ * on the size of the items in the list, or lower if there is insufficient
+ * total memory on the freelist.
*
- * Get the ion_buffer associated with the dma-buf and return the ion_handle.
- * If no ion_handle exists for this buffer, return newly created ion_handle.
- * If dma-buf from another exporter is passed, return ERR_PTR(-EINVAL)
+ * Unlike with @ion_heap_freelist_drain, don't put any pages back into
+ * page pools or otherwise cache the pages. Everything must be
+ * genuinely free'd back to the system. If you're free'ing from a
+ * shrinker you probably want to use this. Note that this relies on
+ * the heap.ops.free callback honoring the ION_PRIV_FLAG_SHRINKER_FREE
+ * flag.
+ */
+size_t ion_heap_freelist_shrink(struct ion_heap *heap,
+ size_t size);
+
+/**
+ * ion_heap_freelist_size - returns the size of the freelist in bytes
+ * @heap: the heap
+ */
+size_t ion_heap_freelist_size(struct ion_heap *heap);
+
+
+/**
+ * functions for creating and destroying the built in ion heaps.
+ * architectures can add their own custom architecture specific
+ * heaps as appropriate.
*/
-struct ion_handle *ion_import_dma_buf(struct ion_client *client,
- struct dma_buf *dmabuf);
+
+
+struct ion_heap *ion_heap_create(struct ion_platform_heap *heap_data);
+void ion_heap_destroy(struct ion_heap *heap);
+
+struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused);
+void ion_system_heap_destroy(struct ion_heap *heap);
+struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *heap);
+void ion_system_contig_heap_destroy(struct ion_heap *heap);
+
+struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data);
+void ion_carveout_heap_destroy(struct ion_heap *heap);
+
+struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data);
+void ion_chunk_heap_destroy(struct ion_heap *heap);
+
+struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data);
+void ion_cma_heap_destroy(struct ion_heap *heap);
/**
- * ion_import_dma_buf_fd() - given a dma-buf fd from the ion exporter get handle
- * @client: the client
- * @fd: the dma-buf fd
+ * functions for creating and destroying a heap pool -- allows you
+ * to keep a pool of pre allocated memory to use from your heap. Keeping
+ * a pool of memory that is ready for dma, ie any cached mapping have been
+ * invalidated from the cache, provides a significant performance benefit on
+ * many systems
+ */
+
+/**
+ * struct ion_page_pool - pagepool struct
+ * @high_count: number of highmem items in the pool
+ * @low_count: number of lowmem items in the pool
+ * @high_items: list of highmem items
+ * @low_items: list of lowmem items
+ * @mutex: lock protecting this struct and especially the count
+ * item list
+ * @gfp_mask: gfp_mask to use from alloc
+ * @order: order of pages in the pool
+ * @list: plist node for list of pools
+ * @cached: it's cached pool or not
*
- * Given an dma-buf fd that was allocated through ion via ion_share_dma_buf_fd,
- * import that fd and return a handle representing it. If a dma-buf from
- * another exporter is passed in this function will return ERR_PTR(-EINVAL)
+ * Allows you to keep a pool of pre allocated pages to use from your heap.
+ * Keeping a pool of pages that is ready for dma, ie any cached mapping have
+ * been invalidated from the cache, provides a significant performance benefit
+ * on many systems
*/
-struct ion_handle *ion_import_dma_buf_fd(struct ion_client *client, int fd);
+struct ion_page_pool {
+ int high_count;
+ int low_count;
+ bool cached;
+ struct list_head high_items;
+ struct list_head low_items;
+ struct mutex mutex;
+ gfp_t gfp_mask;
+ unsigned int order;
+ struct plist_node list;
+};
+
+struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order,
+ bool cached);
+void ion_page_pool_destroy(struct ion_page_pool *pool);
+struct page *ion_page_pool_alloc(struct ion_page_pool *pool);
+void ion_page_pool_free(struct ion_page_pool *pool, struct page *page);
+
+/** ion_page_pool_shrink - shrinks the size of the memory cached in the pool
+ * @pool: the pool
+ * @gfp_mask: the memory type to reclaim
+ * @nr_to_scan: number of items to shrink in pages
+ *
+ * returns the number of items freed in pages
+ */
+int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
+ int nr_to_scan);
+
+long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+
+struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
+ int id);
+
+void ion_free_nolock(struct ion_client *client, struct ion_handle *handle);
+
+int ion_handle_put_nolock(struct ion_handle *handle);
+
+struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
+ int id);
+
+int ion_handle_put(struct ion_handle *handle);
+
+int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query);
-#endif /* _LINUX_ION_H */
+#endif /* _ION_H */
+++ /dev/null
-/*
- * drivers/staging/android/ion/ion_priv.h
- *
- * Copyright (C) 2011 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#ifndef _ION_PRIV_H
-#define _ION_PRIV_H
-
-#include <linux/device.h>
-#include <linux/dma-direction.h>
-#include <linux/kref.h>
-#include <linux/mm_types.h>
-#include <linux/mutex.h>
-#include <linux/rbtree.h>
-#include <linux/sched.h>
-#include <linux/shrinker.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-
-#include "ion.h"
-
-/**
- * struct ion_buffer - metadata for a particular buffer
- * @ref: reference count
- * @node: node in the ion_device buffers tree
- * @dev: back pointer to the ion_device
- * @heap: back pointer to the heap the buffer came from
- * @flags: buffer specific flags
- * @private_flags: internal buffer specific flags
- * @size: size of the buffer
- * @priv_virt: private data to the buffer representable as
- * a void *
- * @lock: protects the buffers cnt fields
- * @kmap_cnt: number of times the buffer is mapped to the kernel
- * @vaddr: the kernel mapping if kmap_cnt is not zero
- * @sg_table: the sg table for the buffer if dmap_cnt is not zero
- * @pages: flat array of pages in the buffer -- used by fault
- * handler and only valid for buffers that are faulted in
- * @vmas: list of vma's mapping this buffer
- * @handle_count: count of handles referencing this buffer
- * @task_comm: taskcomm of last client to reference this buffer in a
- * handle, used for debugging
- * @pid: pid of last client to reference this buffer in a
- * handle, used for debugging
- */
-struct ion_buffer {
- struct kref ref;
- union {
- struct rb_node node;
- struct list_head list;
- };
- struct ion_device *dev;
- struct ion_heap *heap;
- unsigned long flags;
- unsigned long private_flags;
- size_t size;
- void *priv_virt;
- struct mutex lock;
- int kmap_cnt;
- void *vaddr;
- struct sg_table *sg_table;
- struct page **pages;
- struct list_head vmas;
- struct list_head attachments;
- /* used to track orphaned buffers */
- int handle_count;
- char task_comm[TASK_COMM_LEN];
- pid_t pid;
-};
-void ion_buffer_destroy(struct ion_buffer *buffer);
-
-/**
- * struct ion_device - the metadata of the ion device node
- * @dev: the actual misc device
- * @buffers: an rb tree of all the existing buffers
- * @buffer_lock: lock protecting the tree of buffers
- * @lock: rwsem protecting the tree of heaps and clients
- * @heaps: list of all the heaps in the system
- * @user_clients: list of all the clients created from userspace
- */
-struct ion_device {
- struct miscdevice dev;
- struct rb_root buffers;
- struct mutex buffer_lock;
- struct rw_semaphore lock;
- struct plist_head heaps;
- struct rb_root clients;
- struct dentry *debug_root;
- struct dentry *heaps_debug_root;
- struct dentry *clients_debug_root;
- int heap_cnt;
-};
-
-/**
- * struct ion_client - a process/hw block local address space
- * @node: node in the tree of all clients
- * @dev: backpointer to ion device
- * @handles: an rb tree of all the handles in this client
- * @idr: an idr space for allocating handle ids
- * @lock: lock protecting the tree of handles
- * @name: used for debugging
- * @display_name: used for debugging (unique version of @name)
- * @display_serial: used for debugging (to make display_name unique)
- * @task: used for debugging
- *
- * A client represents a list of buffers this client may access.
- * The mutex stored here is used to protect both handles tree
- * as well as the handles themselves, and should be held while modifying either.
- */
-struct ion_client {
- struct rb_node node;
- struct ion_device *dev;
- struct rb_root handles;
- struct idr idr;
- struct mutex lock;
- const char *name;
- char *display_name;
- int display_serial;
- struct task_struct *task;
- pid_t pid;
- struct dentry *debug_root;
-};
-
-/**
- * ion_handle - a client local reference to a buffer
- * @ref: reference count
- * @client: back pointer to the client the buffer resides in
- * @buffer: pointer to the buffer
- * @node: node in the client's handle rbtree
- * @kmap_cnt: count of times this client has mapped to kernel
- * @id: client-unique id allocated by client->idr
- *
- * Modifications to node, map_cnt or mapping should be protected by the
- * lock in the client. Other fields are never changed after initialization.
- */
-struct ion_handle {
- struct kref ref;
- struct ion_client *client;
- struct ion_buffer *buffer;
- struct rb_node node;
- unsigned int kmap_cnt;
- int id;
-};
-
-/**
- * struct ion_heap_ops - ops to operate on a given heap
- * @allocate: allocate memory
- * @free: free memory
- * @map_kernel map memory to the kernel
- * @unmap_kernel unmap memory to the kernel
- * @map_user map memory to userspace
- *
- * allocate, phys, and map_user return 0 on success, -errno on error.
- * map_dma and map_kernel return pointer on success, ERR_PTR on
- * error. @free will be called with ION_PRIV_FLAG_SHRINKER_FREE set in
- * the buffer's private_flags when called from a shrinker. In that
- * case, the pages being free'd must be truly free'd back to the
- * system, not put in a page pool or otherwise cached.
- */
-struct ion_heap_ops {
- int (*allocate)(struct ion_heap *heap,
- struct ion_buffer *buffer, unsigned long len,
- unsigned long flags);
- void (*free)(struct ion_buffer *buffer);
- void * (*map_kernel)(struct ion_heap *heap, struct ion_buffer *buffer);
- void (*unmap_kernel)(struct ion_heap *heap, struct ion_buffer *buffer);
- int (*map_user)(struct ion_heap *mapper, struct ion_buffer *buffer,
- struct vm_area_struct *vma);
- int (*shrink)(struct ion_heap *heap, gfp_t gfp_mask, int nr_to_scan);
-};
-
-/**
- * heap flags - flags between the heaps and core ion code
- */
-#define ION_HEAP_FLAG_DEFER_FREE (1 << 0)
-
-/**
- * private flags - flags internal to ion
- */
-/*
- * Buffer is being freed from a shrinker function. Skip any possible
- * heap-specific caching mechanism (e.g. page pools). Guarantees that
- * any buffer storage that came from the system allocator will be
- * returned to the system allocator.
- */
-#define ION_PRIV_FLAG_SHRINKER_FREE (1 << 0)
-
-/**
- * struct ion_heap - represents a heap in the system
- * @node: rb node to put the heap on the device's tree of heaps
- * @dev: back pointer to the ion_device
- * @type: type of heap
- * @ops: ops struct as above
- * @flags: flags
- * @id: id of heap, also indicates priority of this heap when
- * allocating. These are specified by platform data and
- * MUST be unique
- * @name: used for debugging
- * @shrinker: a shrinker for the heap
- * @free_list: free list head if deferred free is used
- * @free_list_size size of the deferred free list in bytes
- * @lock: protects the free list
- * @waitqueue: queue to wait on from deferred free thread
- * @task: task struct of deferred free thread
- * @debug_show: called when heap debug file is read to add any
- * heap specific debug info to output
- *
- * Represents a pool of memory from which buffers can be made. In some
- * systems the only heap is regular system memory allocated via vmalloc.
- * On others, some blocks might require large physically contiguous buffers
- * that are allocated from a specially reserved heap.
- */
-struct ion_heap {
- struct plist_node node;
- struct ion_device *dev;
- enum ion_heap_type type;
- struct ion_heap_ops *ops;
- unsigned long flags;
- unsigned int id;
- const char *name;
- struct shrinker shrinker;
- struct list_head free_list;
- size_t free_list_size;
- spinlock_t free_lock;
- wait_queue_head_t waitqueue;
- struct task_struct *task;
-
- int (*debug_show)(struct ion_heap *heap, struct seq_file *, void *);
-};
-
-/**
- * ion_buffer_cached - this ion buffer is cached
- * @buffer: buffer
- *
- * indicates whether this ion buffer is cached
- */
-bool ion_buffer_cached(struct ion_buffer *buffer);
-
-/**
- * ion_buffer_fault_user_mappings - fault in user mappings of this buffer
- * @buffer: buffer
- *
- * indicates whether userspace mappings of this buffer will be faulted
- * in, this can affect how buffers are allocated from the heap.
- */
-bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer);
-
-/**
- * ion_device_create - allocates and returns an ion device
- *
- * returns a valid device or -PTR_ERR
- */
-struct ion_device *ion_device_create(void);
-
-/**
- * ion_device_destroy - free and device and it's resource
- * @dev: the device
- */
-void ion_device_destroy(struct ion_device *dev);
-
-/**
- * ion_device_add_heap - adds a heap to the ion device
- * @dev: the device
- * @heap: the heap to add
- */
-void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap);
-
-/**
- * some helpers for common operations on buffers using the sg_table
- * and vaddr fields
- */
-void *ion_heap_map_kernel(struct ion_heap *heap, struct ion_buffer *buffer);
-void ion_heap_unmap_kernel(struct ion_heap *heap, struct ion_buffer *buffer);
-int ion_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
- struct vm_area_struct *vma);
-int ion_heap_buffer_zero(struct ion_buffer *buffer);
-int ion_heap_pages_zero(struct page *page, size_t size, pgprot_t pgprot);
-
-/**
- * ion_heap_init_shrinker
- * @heap: the heap
- *
- * If a heap sets the ION_HEAP_FLAG_DEFER_FREE flag or defines the shrink op
- * this function will be called to setup a shrinker to shrink the freelists
- * and call the heap's shrink op.
- */
-void ion_heap_init_shrinker(struct ion_heap *heap);
-
-/**
- * ion_heap_init_deferred_free -- initialize deferred free functionality
- * @heap: the heap
- *
- * If a heap sets the ION_HEAP_FLAG_DEFER_FREE flag this function will
- * be called to setup deferred frees. Calls to free the buffer will
- * return immediately and the actual free will occur some time later
- */
-int ion_heap_init_deferred_free(struct ion_heap *heap);
-
-/**
- * ion_heap_freelist_add - add a buffer to the deferred free list
- * @heap: the heap
- * @buffer: the buffer
- *
- * Adds an item to the deferred freelist.
- */
-void ion_heap_freelist_add(struct ion_heap *heap, struct ion_buffer *buffer);
-
-/**
- * ion_heap_freelist_drain - drain the deferred free list
- * @heap: the heap
- * @size: amount of memory to drain in bytes
- *
- * Drains the indicated amount of memory from the deferred freelist immediately.
- * Returns the total amount freed. The total freed may be higher depending
- * on the size of the items in the list, or lower if there is insufficient
- * total memory on the freelist.
- */
-size_t ion_heap_freelist_drain(struct ion_heap *heap, size_t size);
-
-/**
- * ion_heap_freelist_shrink - drain the deferred free
- * list, skipping any heap-specific
- * pooling or caching mechanisms
- *
- * @heap: the heap
- * @size: amount of memory to drain in bytes
- *
- * Drains the indicated amount of memory from the deferred freelist immediately.
- * Returns the total amount freed. The total freed may be higher depending
- * on the size of the items in the list, or lower if there is insufficient
- * total memory on the freelist.
- *
- * Unlike with @ion_heap_freelist_drain, don't put any pages back into
- * page pools or otherwise cache the pages. Everything must be
- * genuinely free'd back to the system. If you're free'ing from a
- * shrinker you probably want to use this. Note that this relies on
- * the heap.ops.free callback honoring the ION_PRIV_FLAG_SHRINKER_FREE
- * flag.
- */
-size_t ion_heap_freelist_shrink(struct ion_heap *heap,
- size_t size);
-
-/**
- * ion_heap_freelist_size - returns the size of the freelist in bytes
- * @heap: the heap
- */
-size_t ion_heap_freelist_size(struct ion_heap *heap);
-
-
-/**
- * functions for creating and destroying the built in ion heaps.
- * architectures can add their own custom architecture specific
- * heaps as appropriate.
- */
-
-struct ion_heap *ion_heap_create(struct ion_platform_heap *heap_data);
-void ion_heap_destroy(struct ion_heap *heap);
-struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused);
-void ion_system_heap_destroy(struct ion_heap *heap);
-
-struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *heap);
-void ion_system_contig_heap_destroy(struct ion_heap *heap);
-
-struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data);
-void ion_carveout_heap_destroy(struct ion_heap *heap);
-
-struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data);
-void ion_chunk_heap_destroy(struct ion_heap *heap);
-struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data);
-void ion_cma_heap_destroy(struct ion_heap *heap);
-
-/**
- * functions for creating and destroying a heap pool -- allows you
- * to keep a pool of pre allocated memory to use from your heap. Keeping
- * a pool of memory that is ready for dma, ie any cached mapping have been
- * invalidated from the cache, provides a significant performance benefit on
- * many systems
- */
-
-/**
- * struct ion_page_pool - pagepool struct
- * @high_count: number of highmem items in the pool
- * @low_count: number of lowmem items in the pool
- * @high_items: list of highmem items
- * @low_items: list of lowmem items
- * @mutex: lock protecting this struct and especially the count
- * item list
- * @gfp_mask: gfp_mask to use from alloc
- * @order: order of pages in the pool
- * @list: plist node for list of pools
- * @cached: it's cached pool or not
- *
- * Allows you to keep a pool of pre allocated pages to use from your heap.
- * Keeping a pool of pages that is ready for dma, ie any cached mapping have
- * been invalidated from the cache, provides a significant performance benefit
- * on many systems
- */
-struct ion_page_pool {
- int high_count;
- int low_count;
- bool cached;
- struct list_head high_items;
- struct list_head low_items;
- struct mutex mutex;
- gfp_t gfp_mask;
- unsigned int order;
- struct plist_node list;
-};
-
-struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order,
- bool cached);
-void ion_page_pool_destroy(struct ion_page_pool *pool);
-struct page *ion_page_pool_alloc(struct ion_page_pool *pool);
-void ion_page_pool_free(struct ion_page_pool *pool, struct page *page);
-
-/** ion_page_pool_shrink - shrinks the size of the memory cached in the pool
- * @pool: the pool
- * @gfp_mask: the memory type to reclaim
- * @nr_to_scan: number of items to shrink in pages
- *
- * returns the number of items freed in pages
- */
-int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
- int nr_to_scan);
-
-long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
-
-struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
- int id);
-
-void ion_free_nolock(struct ion_client *client, struct ion_handle *handle);
-
-int ion_handle_put_nolock(struct ion_handle *handle);
-
-struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
- int id);
-
-int ion_handle_put(struct ion_handle *handle);
-
-int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query);
-
-#endif /* _ION_PRIV_H */
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff